2003 Ski-Doo REV Series Factory Shop Manual, Page 94Get this manual
Section 03 TROUBLESHOOTING Subsection 05 (ELECTRICAL SYSTEM)
SYMPTOM CONDITION TESTINSPECTION
HEADLAMP DIMINGNORMAL USE1Check voltage at headlamp at different speedsIt must not be below 11 VacaInsufficient voltage in lighting circuitReplace voltage regulator and retest2Visually inspect wiring harness for damaged andor melted wires andor bad wire terminal crimping andor connectionsaHeating, rotating or sharp part in contact with harnessImproper harness routingRepairreplace damaged wires andor terminalsReroute harness where necessary3Check if optional electric accessories are overloading the magnetogeneratoraExcessive electrical load to magnetogeneratorReduce the electrical load by removing excess accessoriesReconnect as recommended by manufacturer4Hot Grips brand: Verify if they were connected in parallel by mistakeaExcessive electrical load to magnetogeneratorReconnect as recommended by manufacturer5Check if heating grips installation overloads the magneto capacityaExcessive electrical load to magnetogeneratorReduce the electrical load by removing accessories